control of heart rate Flashcards
what is myogenic
contraction initiated from within the muscle itself
where does the orginial impulse orginate from
the SAN
what does the SAN determine
the rhythm of the heartbeat
what part of the brain controlls the rate of heart beat
medulla oblongata
how come the ventricles don not contract
as their is a layer of non conductive tissue stopping the impulse from travelling into the ventricles
to start heart beat what does the SAN do
send an electrical impulse across voth atria so they contract.
what instead is the impulse converted through
atrioventricular node
where does this impulse then go to
the bundle of HIS
once it reaches the bundle of his what occurs
an electrical impulse travels through the pikinji fibres
what does this cause the ventricles to do
contract rapidly
